Stone working – Sawing – Endless
Patent
1987-02-05
1988-08-16
Olszewski, Robert P.
Stone working
Sawing
Endless
51141, 83 71, 83 74, 83789, 83814, B28D 108
Patent
active
047636378
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates to a stone saw comprising a revolving sawing rope, which is backed against the cutting pressure by backing rollers at both ends of at least one sawing portion, also comprising a feed drive and housings in which the backing rollers are mounted and which are pivotally adjustable about the axis of the sawing rope in dependence on the direction of the feed movement.
In such stone saws, which are known from AT-B- No. 371,761, the pivotal adjustment of the backing rollers about the axis of the sawing rope has the result that the forces which are exerted on the backing rollers owing to the cutting pressures applied will be at right angles to the axes of rotation of said rollers so that the side faces of the rope-guiding groove of the backing roller will not be subjected to substantial loads. This ensures that the wear of the rope-guiding grooves will be minimized and the rope will be exactly guided even after a prolonged operation.
Whereas such a guidance of the rope is necessary for an exact contour sawing it is not adequate for that purpose. For an exact control of the direction of the cut, the axis of rotation of each of the housings in which the backing rollers are mounted must coincide with the axis of the sawing rope. The inevitable wear of the rope-guiding grooves will result in a shift of the axis of the sawing rope relative to the structurally defined axis of rotation of the housing so that, e.g., curves having a small radius of curvature can no longer be cut as exactly as is required.
SUMMARY OF THE INVENTION
For this reason it is an object of the invention to avoid that basic disadvantage of known stone saws of the kind described first hereinbefore and to ensure that the rope will be guided in such a manner that an exact contour sawing can be performed in spite of the inevitable wear.
That object is accomplished in accordance with the invention by mounting the backing rollers in the housings for an adjustment transversely to their axis and to the axis of the sawing rope, and displaceable toward the axis of the sawing rope by a correcting drive operable in dependence on the radial wear of the backing rollers.
Because the backing rollers are readjusted by the correcting drive to the extent of the wear of the rope-guiding grooves, a shifting of the axis of the rope from the axis of rotation of the housing will be avoided and the sawing rope will remain in position during a pivotal adjustment of the housing so that all requirements for an exact control of the line of cut are met.
But this result cannot be achieved if the sawing rope can lift from the backing rollers. To avoid this, the housings may be provided on that side of the axis of the sawing rope which is opposite to the backing rollers with pressure-applying rollers for the sawing rope and said pressure-applying rollers are offset along the axis of the sawing rope away from the sawing portion from those backing rollers which are near the sawing portion. Regardless of variations of the diameter of the sawing rope and regardless of a wear of the backing rollers and the pressure-applying rollers, the spring-loaded pressure-applying rollers ensure a snug contact between the sawing rope and the backing rollers so that vibrations to which the rope may be excited outside the sawing portion will not be transmitted to the sawing portion. Because the pressure-applying roller is offset along the axis of the sawing rope away from the sawing portion from those backing rollers which are near the sawing portion, the configuration of the sawing rope adjacent to the sawing portion will be determined by the backing roller that is near the sawing portion rather than by the springloaded pressure-applying roller. In the design of the spring means for supporting the pressure applying rollers, care must only be taken to ensure that the natural frequency of the vibratory system comprising the springloaded pressure-applying rollers is not in the range of the vibrational frequencies of the sawing rope. The resilient pre
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patent: 3395595 (1968-08-01), Braun et al.
patent: 4016856 (1977-04-01), McLaughlin
patent: 4067312 (1978-01-01), Tessner
Kelman Kurt
Olszewski Robert P.
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